Britain's tiniest toddlers.

There are less than 150 primordial dwarfs in the world. Here we meet 3 of them, all with microcephalic osteodysplastic primordial dwarfism 2 (MOPD 2) - Finn, Liam and Alex. We follow them in their daily lives and get an insight into their precarious medical conditions and the anxiety faced by their parents as they come to terms with their tiny childrens' limited life expectancy. The key medical concerns are brain aneurysms and a condition called moyamoya.